Improvement in pomps



vherein described for the purpose specified. Y

v @eine gieten anni @fitta GEORGE SHIELD, OF cincfifuuarl, OHIO.

' Letters Patent No. 70,634, dated November 5, 1867.

IMPROVEMENT IN PUMPS.

TO ALL WHOM IT MAY GONCERN:

. Be it known that I, GEORGE SHIELD, of Cincinnati, in the county of Hamilton, and State of Ohio, have invented a new and improved Double-Plunger Pump; and I do hereby declare that the following is a'full, clear, and exact description thereof, which will enable others skilled in the art to make and yuse the same, reference being had to the accompanying dra. wings,vforming part of this specification. I

This invention relates to a new and improved method of constructing pumps, and the invention consists in forming the pump-barrel in two parts, and in using two plungers, one a solid or closed plunger, and the other a shell or open plunger, as lwill be hereinafter described.

Figure 1 represents a vertical central section of the pumprthrough the line v:z: :c of fig. 2.

Figure 2 is a horizontal section through the line y of iig. 1.-

Similar letters of reference indicato like parts.

A is the upper part of the barrel, and B is the lower part. These parts forming the barrel are connected together by bolts, but each part has a stuing-box, a a, arranged as seen in the drawing, for the p iirpose of packing the lower plunger. C represents the lower plunger. This plunger is packed by the stuing-boxes a a,

as seen. It is open lat both ends, but with a. valve at the top end, marked d. D is the valve-rbd., V E is the solid or closed plunger. Both plungers are attached to the valve-rod D. Each part of thc'barrel has a branch,

A and B. Upon the upper one the air-chamber and the discharge pipe are placed. -The air-chamber isiinarked F, and the discharge lpipe is marked Gr. The water is admitted to the discharge pipe through the valveL. To the lower branch is attached the supply pipe g. The water is admitted through a vulve, z', into the pump-barrel B.

When the plungcrs, which work together, descend, the water passes' up lthrough plunger C, raises the valve d, and enters thebranch A', and is forced by the plunger E through the valve hinto the air-chamber,from which it is discharged through the pipe G.

There is a collar, e, on the valve-rod, which acts as a stop for the valve d as it rises. The upper plunger is packed by a stuiing-box,f, and access is had to the valves in the branches A B by'platcs, which jarepacked ontothe branches and fastened b'y screws, as seen. The `lower plunger C is double the sizeor areaof the upper'one, and the quantity of waterforced into the air-chamber by the upper plunger is equal to the difference in their areas. v

What I elairhvl as new,and desire to secure by Letters Patent, is

1. The combination and arrangement'of the hollow plunger C, valve-rod D, valve d, solid' or closed plunger E, plate e, and stuing-boxes a a, asherein described for the purpose specified.

2. The solid or closed pluger E, in combination with the hollow plunger C, valve d, and discharge passage A', as herein described for the purpose specified.

3. The double-plunger pump', constructed as described, consisting of the barrel A B, with branches AlB, stuing-boxes a a, hollow plunger C, solid or closed plunger E, valve d, plate e, chamber F, and pipes G' g, as

GEORGE SHIELD.

'Witnesses C. F. HAUSELMANN, KASPAR EMMEnIcH. 

